Throttle valve for pneumatic tools



Oct, 4 1644 523 1927 A. E. HENDRlcKs A THR'OTTLE VALVE FOR PNEUMATIC AToons Filed sept. 10.1923

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Patented Oct. 4, '11927.1*

COMPANY; on' CHICAGO, ILLINOIS, f-A- CORPORATION or -iLLiNoisf' THROTTIE. VALVE non PNnUiviA'riC Toots@ application nieu september 1o, ,1923. lserrait No. senese. s

i This invention relates to throttle-rvalvesl orcontrollingthe admission oi' motive iiuid Y to .pneumatic tools or the like. y s Amongotherobjects, the invention is intended to p rovidea.practicable, reliable and eilicienty throttle valve of the class stated.

The invention will'be Clearly understood Yby K reterence .to -an illustrative structure conik taining an. embodiment ot the invention, mshownin the annexed drawings, in which:

Fig. l isa ,vertical section oi' the illustrative structure, showings the throttle .valve in Vnormalor released position.

' Fig', 2 is a similar viewoi' thevalve-containing portion. of'` said structure showing thet-hrottle 'valve inactive position.

Fig.` 3 Aisa detail elevation of a movable throttle valve member.` v

Fig. iis a similarelevationof said `valve s member, viewedjfrom"theY oppositeside. k

s Fig.` 5 is a horizontal V'section ofsaidvalve member taken on theline 5-5 ot Fig., e, indicating the size of the throttlevalve ports whenr said member. is moved slightly from 25, normal position. y y i Fig. 6 is ahorizontal section taken onthe sectionline-G of Fig.4, and indicating .the size of the throttley valve'ports whenin full open position.` f

40 e u i nectionwith a compressed air supply pipe,

is' designated at 4. Distribution ports, lead- A ingir'oml said passage to the valve mechanism housed in the, handle base, are designatedat 5f Thethrottle valve of the illustrative structure is interposed in the passage 3 and controls'theflowfof the motive iiuid between the inlet and distributionbranches of said 'Y passage.

Said throttle valve'comprises a movable valve member represented by ya rod or stem 6,v and a valve-seatmember represented by ashortsleeve or bushing? Tinwhich the rod has a sliding; fit.

os'aidpassage, interiorly threaded for con- Annamaria. HENDRICKS, lora-'cirrondo; iniiiNois, Ass-IGNOR-To -INGfrNii.ontario-roon.-

sidbushiag ri'ditidefs'the triangulaii bei` into what .may be termed a pressure-inletfchamber. Sand a working .pressure `oh'am-l bert). `@in this4 instance, said chambers` 8.,a'nd` 9 are infwide open-.gcommunication with. the

inlet and distribution branches of the pas?v lsage 3'through the'handle, and may beconi 5 siciered as1 o exemplifying either Adistinct chambers in brancheslof the passage 'or' as substaiitia'lly,i the portions of said passage 3 at the oppositesides ofthe throttle valve. v

communication .i withw.' said Throttle valve ports are representedi'fby if longitudinal 4grooves '10 'in the valve .member G. The relation of these grooves,l the valve member, and the bushing T ,is-suoh that at one' end of thefpathfof movement of Vthe valve member 6', the flatter VPFI-"events i theV passageA of motive vfluid throughftlie bushing. As the valve member-6 isliiiovediI from closedV position a gradually` yincreasing f passage of motiveflu'id occurs throughthese ports untilv the valve is in completely ,open

condition. l'These grooves may be conveniently formed ,by milling .out parts ofthe:

. valve lmember and are shown extendingl longitudinally of that member Vwith'thei'r axes in parallel relations. l y, y For varying the capacity of thelvalve' and for determining j its" sensitiveness of control of the passage ofimotive vfluid therethrough, Y the number of ythe grooves 1Q may vary iacso fcording to the needsofactual practice,.but 'i experiments have shown that 'the number` formed in the illustrative embodimentfof the invention is suitable and eective Vto admit of a suiiicientflow of themotivefluid`,fand an adequate control or' "its passageforfoperating pneumatic: tools.' Tota'cilitate a f Vvery, gradual admissionf of motive iuid o through the valve, these grooves 'are'shown so arranged that theirlower endsvareV loi' i cated at different Ydistancesffrom the end of that member. Any effective arrangement 'of this kind is one-'in which the grooves have.

Y' their lower ends so positioned that' 4a line passing progressively, through the centers ofV those ends will 'be substantiallyspirallyrej lated to the surface of the movable`valve member. Y

Vith such a spiralarrangement' ofthe lower ends off the grooves,*the'l ports'are `profluid pastV the bushingt4 7 f As the .movable valve member is moved through the bushing, 'A

ioov

'gressively opened to allow'passage of motive 831iY passage andthe Vremaining grooves netonf-snccegfsfsively Y to Y' produce a cumulaf" mem er they tool-` Ahe' .lnay` hold the movable valve membergin such a po-sitioni that only V one of fi dgrfes lofi: control'Y dependent the s Y n Y n an ithehumberbfPortsith'erreeas fqrefjmentionedL ri; gadualffadniissionfof lceompanymgftool Vis.'ffliitlier ensuredby the -alnnlt ofjftheii lengths;and ytheir t thgradually-decrease as either ponds,'."jThUSi'fasthev' movable 'einher 'isf first moved rfronr Vgolosed 1.1,

lierethrongh,"v Eurther lmove- "pine Y diieeton causes Va1 gradual the "sizeff andf capacity fof Vthat ewa;V n 1 so that the l s 'eed fof-'operation o] f fd `efsjeifibed permits nicety tothe-"tool, and is adapt'ed'to be #type j 1S 9H ,itu -11,

Yejluidfthevalve Will Wrkwithonft undue I'isarrangement enhances the sealing effect lveln-clo'sed lposition andis .con-

iixfevvlthout frequent repairs. has 1 been previonsly,nm'ntioned, the ovable :valve member is arranged tov Aop- 'btivefn 'the inlet and the y distribution anhe's. ef: a Passageextehdine through the -easingf .Ani `SlPPIOpriate arrangement 'of this `kind "is 'illustrate-d; in' which thevaivei rpd eg1pt vea'l/SQY fnnetioning .to` permit the pasl f '.`ens'nring*they prevention' .o'jthev leakage of A Y Y :motive iiuidfwhen zthefpiimary valvepartso desi-red' The"speechofopera-V.v

tool 'and he intensity i of the: 1 re-y eted' lfitlsj operatir-may have a 'esilio formation-tofthev valve. y

L is A'losedQsoony after they movable yvalve meinz 1 il'rnlation' f tliefgroovesf'fhey alre'shoWn. and Widest f at their, 'central p'ortions,

i heid; lllelf'depthj approaching the intensity digits @eert 'is r 1s substa tially coincident in Y n Y Y f ment herein shown' asa lsert-wv plug 14.3* the latter 1s shownbe'velled In 'the construction shown, ythe screwplng tawayat itsiipdper and'in'ner edgejf A" l'fni' lthel admission and fflovv of `mo easily; opereren repasa armes entrati-ve,

i elif vWorks 'in abuh'ing 01" 'sleeve vided atfropposite "sides vvith 7 the al. `g`roovesforfthe passage of mo# iiigfthere4 being no uneqilal lateral pres#V onfthejrodi 'constituting the valve and no by pressure ofthe valve toi its seat;`

fr toflong-,continued"use" of the struc- Eisslidably'ttedlinvajbore;intersecting the' I thrttgle' casing at ther W rli' of the throtnQ-Chamber l AFor' cooperation With the. v*movable valve` member and. thef'bushing.- above described, a check valveg'fis'provided, represented 'by aV balle` 12.1 `lfl-inong"fotfher r-esultsfthis check valve or ball; l2 v serves the purpose of lfllrther are jin valveclosing positions" In the lcon# ed to 'be' displaced by` the 5 valve member The 4arrangementis 'suchy that the check valve berf'has' reached itsYA oWn; elosedfposition.

Thisinvolves the spacing of" theI check valve ashort'distance from the groove having one f,

Y'Within a socket inthe endoffthemember 6 speci-JV t0 that lblllnflberrA vtaneously with the movable; valvev member or 1rod .6% therball'is urged against fthe end of 'tli'eflattei' 'hva resilient'membe'r herein shown* Lasv a'coiled spring This spring" also acts toforce(the'ballagainst the inner `and lower edge'o'fftlie bushing 7 vvlienfthefi'ormeris 'Vj-permittedjto reach oneendi otite-path of 5 movement, and When thejb'all r`is so seated* it acts asan additionalseal'ltofprevent leakballV andthe other end' actsjaga'inst an abut- VM notonly serves theffpurpose Otan abut- -1i1entmember `for Vthe spring' 13",' but ,also

fornisa convenient-"closure Jfor the chamber. in vvhiohthe valv'eparts are located. llhe;J plug is mounted in the throttle casing iny Y lsuch a position asnottobinterfere'Withzthe yuse thereof; j By removing fthe pliig the valve 'partsjfare accessible ffor. convenient yinspe'c- L .tion, repairor disassembly.

The'spring 13 of the illustrative structure isutlized to urge 'both thefvalvemeinber `6 -and the check valvef12'into valve closing condition; and, in oroler-tov opentfhevalve,

located lever l'ypivotally inon'ntedfupon the 1 ulcrum member supp'orted by the tool handle, andV acting upon the oppositehend of f the roel 6 A portionfofythis lever lis arranged Within'thepath'o'f movement ofthe lrod 6 so' asfto actnat-eLthe same against' the force of the spring. In order that this leverf1w may be substantially inclosed bythe throttle v endf'nearest the endfof the v:movable valve 'l i member. In this instance, the ball l2 flits .f gage votmotive"tlnid, as ab'ove` `mention ed. ff 4 One endoik'theyspring lcontacts yvvithi the e ,los

means` 1s prov1ded for moving theabove r mentionedparte inla'n oppositedirection. l

Such means 1s represented by a convenientlyV f Y so as tothereby'beheld vcentered withv reflui V heisses casing, a slot 17 may be bored in the upper surface of the latter and the fulcrum member 16 may pass therethrough.

To prevent'sharp movement of the lever from being communicatedto the rod 6 so as to allow a sudden inrush of motive fluid causing vthe-tool to beset into operation instantly Vat arapid rate, cushioning in eans is interposed between that part of the lever 15 which extends into the path of movement of the rod, and the rod 6 itself. This cushioning means may be located in a socket 18 bored in the upper end of the rod,y and, in the present` instance, consists of a cap 1.9 which is capable of movement relative to the rod and held normally spaced from the latter by a resilient element herein shown as a spiral spring 20.

gradual and even movement of the port controlling member when moved to open the valve. p

T he structure'described provides a throttle valve which is extremely sensitive in operation, automatically closing when not in use, and capable of permitting the passage therethrough of a. desired amount of motive-fluid4 per unit of time to effectively operate the tool to which it is applied. Such va throttle valve enables the operator to use the tool with different motive fluid pressures so as to inaintainany desired character of impact, i. e., light or heavy as desired, and thus renders the tool effective under widely varying conditions. Y

The operation of the entire throttle valve will be apparent to those skilled in the art, from the previous description, considering lthe throttle casing to be connected on one side to a source of motive fluid, and on the other, to a tool to be operated. The valve is capable of withstanding constant useunder high pressure without excessive wear, and

` its moving parts are reduced to a minimum.

Ol v

The valve is susceptible of economical manufacture by reasonof the' simplicity of its structure, and may be assembled in' a pneumatic tool without the prior assembly rl`his cushioning means, as above indicated, acts to further ensure a order that it may be usedin handles of different types of conventional pneumatictools which `use has proven to involve distinct advantages.

Obviously the present invention is *not` limited to the specific embodiment herein shown and described. Moreover 1t is not indispensable that all of the features of the invention be used conjointly since they may be advantageously used in various different.

combinations and sub-combinations.

Having described my invention, I claim:` `l. A throttle valvefofthe class described.

comprising, in combination, a throttle chamber; a partitioning sleeve therein; a valve comprising a rod slidable through said sleeve and noriiially closing thesame; said rod having ports normally located wholly at' one side or' said sleeveV and adapted upon movement of the valve to active 'position to 4establish communication between vrthe opposite sides of saidchamber; a check valve opposing movement of said rod from normal position, said checkvalve adapted to be unseated by said rod; and meansr for operating said valve rod against the opposition of said checkV` valve.` 'l

n 2. A throttle valve comprising, in combination, a throttle chamber; a partitioning Asleeve therein; a valve comprising a' rod slidable'throughsaid sleeverv and normally closing vthe same; `said rod having ports normallyv located wholly at one side of said sleeve and adapted upon movement ofthe valve to active position to establish communication between the opposite sides of said chamber; a check valve com-r prising an independent ball seatedV against said sleeve; .a spring acting uponthe ball and thereby indirectlyv acting against the asfV `'of the class described"- rod to maintain vthe throttle valvey closed; l'

and means for operating said rod against the opposition of said ball and spring t 3. A throttle valve of the class described comprising, incombination, a throttle casing having a passage' for motive fluid; a movable throttle valve member and a cooperating check valve controlling said passage; the

' said check valve arranged to be unseated'by the movement of said movable valve inember; said movable valve member acting to cut olf the ingress of motive fluid 'when in one position, and to present gradually increasing port capacity for the inlet of motive Huid as it is moved in one direction from that position. i

In testimony whereofI havesigned my name tothis sp'ecilication.

ALBERT E. HENDRICKS. i

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